Plans for a landmark summit with North Korea's Kim Jong Un are moving "very nicely", US President Donald Trump says today, as the South's leader says Kim told him the talks would be a historic opportunity to end decades of confrontation.

North Korea says today it is still willing to talk to the United States after President Donald Trump abruptly cancells a summit between the two countries, a decision that has thrown the Korean peninsula once more into uncertainty.

US President Donald Trump on Monday urges China to maintain tight control of its border with North Korea until he signs a denuclearization deal with Kim Jong Un.

The United States demands North Korea ship some nuclear warheads, an intercontinental ballistic missile (ICBM) and other nuclear material overseas within six months, the Asahi newspaper says on Thursday, citing several sources familiar with North Korean issues.

The United States promises Friday that it would work to rebuild North Korea's sanctions-crippled economy if Kim Jong Un's regime agrees to surrender its nuclear arsenal.